Flexible Display Driving Track Tension Control
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Solution Overview
Problem
Flexible display devices face challenges in applying uniform tension and controlling springback when the exposed area is varied, leading to unevenness and potential damage, particularly in foldable and rollable devices where the flexible display is elastically deformed.
Innovation Solution
A flexible display device with a driving track system that includes pulleys, a moving plate, and a chain with guide plates to maintain uniform tension and prevent warping, featuring a back plate with transformable areas to manage deformation and a magnetic system to prevent lifting, ensuring stable positioning on a single plane or curved surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the flexible display is elastically deformed to vary the exposed area in foldable and rollable devices, then the display area can be increased or reduced, but springback occurs causing interference, friction, or damage to the flexible display and device operation
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of the flexible display through controlled elastic deformation. The display is intentionally deformed beyond its neutral plane during folding or rolling operations, and the system manages the springback effect by providing support structures that accommodate this deformation. This allows the exposed area to vary while managing the reliability issue through structural support rather than preventing the deformation itself.
2Area of moving object
If the flexible display is moved during operation to vary the exposed area, then the display can be extended or retracted, but uniform tensile force cannot be applied causing unevenness and difficulty in operation
Solution Approach 1:
The patent introduces a support structure as an intermediary element between the flexible display and the device housing. This support structure includes support portions that contact and support the flexible display during movement, ensuring uniform tensile force distribution. The intermediary support structure prevents direct contact between the flexible display and potentially damaging surfaces while maintaining operational smoothness.
Solution Approach 2:
The support structure's position and configuration are changed according to the state of the flexible display. As the display extends or retracts, the support portions move accordingly to maintain proper support, ensuring uniform tension and smooth operation throughout the range of motion.
3Area of moving object
If the flexible display is deformed to increase the exposed area, then the display can be extended, but springback in the deformed portion becomes difficult to control
Solution Approach 1:
The patent controls springback by changing the parameter of support contact. The support structure is designed to contact the flexible display at specific positions and with specific forces that counteract the springback effect. By adjusting the support parameters (position, force, contact area), the system achieves precise control over the display's deformation and restoration behavior.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures uniform tension is applied across the flexible display, minimizing springback and preventing damage by maintaining stable positioning and neutral plane alignment, thus enhancing the operational smoothness and longevity of the device.
Implementation Method 1
a magnetic system to prevent lifting
Data Source
AI summary
A flexible display device is provided. A flexible display device according to one embodiment of the present invention comprises a body, a moving plate, a first pulley, a second pulley, a driving track and a flexible display. The flexible display is coupled to outer surfaces of the moving plate and the driving track, and the driving track forms a continuous track shape by itself or together with the moving plate. Therefore, provided is the flexible display device in which a constant tension can be maintained over the entire section of the driving track while the moving plate and the driving track support the flexible display, the occurrence of spring back in the flexible display can be minimized, and damage caused by unevenness of the flexible display, and the like, can be prevented.